Fighting Man of the Plains (1949)

Gunslinger and former Confederate Jim Dancer (Randolph Scott) is on a mission to find his brother's killer but mistakenly shoots the wrong man, leading him to become an outlaw. Later, Dancer takes on the identity of a deceased marshal and comes into conflict with a ruthless band of criminals but receives help from a renowned old war buddy. Dancer also finally gets a chance to face off against his sibling's real murderer, Bert Slocum (Barry Kelley), in a tense showdown.